data:extend(
{
  {
    type = "item-group",
    name = "resources",
    order = "resources",
	inventory_order = "resources",
    icon = "__Factorio-Resources__/graphics/item-group/metals.png",
  },
  {
    type = "item-subgroup",
    name = "resources-ores",
    group = "resources",
    order = "1"
  },
  {
    type = "item-subgroup",
    name = "resources-plates",
    group = "resources",
    order = "2"
  },
}
)